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    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
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<body>
    <script>
        //用于获取对象自身所有的属性
        var obj ={
            id:1,
            pname:'小米',
            price:1999,
            num:2000
        }
        var arr = Object.keys(obj);
        console.log(arr);

        arr.forEach(function(value){
            console.log(value);
        })
    </script>
</body>
</html>